Set plugin template minimum Flutter SDK to 2.5 (#89695)

packages/flutter_tools/templates/plugin/ios-objc.tmpl/projectName.podspec.tmpl

@@ -16,7 +16,7 @@ Pod::Spec.new do |s|
   s.source_files = 'Classes/**/*'
   s.public_header_files = 'Classes/**/*.h'
   s.dependency 'Flutter'
-  s.platform = :ios, '8.0'
+  s.platform = :ios, '9.0'
 
   # Flutter.framework does not contain a i386 slice.
   s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }

packages/flutter_tools/templates/plugin/ios-swift.tmpl/projectName.podspec.tmpl

@@ -15,7 +15,7 @@ Pod::Spec.new do |s|
   s.source           = { :path => '.' }
   s.source_files = 'Classes/**/*'
   s.dependency 'Flutter'
-  s.platform = :ios, '8.0'
+  s.platform = :ios, '9.0'
 
   # Flutter.framework does not contain a i386 slice.
   s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }

packages/flutter_tools/templates/plugin/pubspec.yaml.tmpl

@@ -5,7 +5,7 @@ homepage:
 
 environment:
   sdk: {{dartSdkVersionBounds}}
-  flutter: ">=1.20.0"
+  flutter: ">=2.5.0"
 
 dependencies:
   flutter:

packages/flutter_tools/test/commands.shard/permeable/create_test.dart

@@ -2325,7 +2325,7 @@ void main() {
     Logger: () => logger,
   });
 
-  testUsingContext('newly created plugin has min flutter sdk version as 1.20.0', () async {
+  testUsingContext('newly created plugin has min flutter sdk version as 2.5.0', () async {
     Cache.flutterRoot = '../..';
 
     final CreateCommand command = CreateCommand();
@@ -2334,8 +2334,8 @@ void main() {
     final String rawPubspec = await projectDir.childFile('pubspec.yaml').readAsString();
     final Pubspec pubspec = Pubspec.parse(rawPubspec);
     final Map<String, VersionConstraint> env = pubspec.environment;
-    expect(env['flutter'].allows(Version(1, 20, 0)), true);
-    expect(env['flutter'].allows(Version(1, 19, 0)), false);
+    expect(env['flutter'].allows(Version(2, 5, 0)), true);
+    expect(env['flutter'].allows(Version(2, 4, 9)), false);
   });
 
   testUsingContext('default app uses Android SDK 30', () async {